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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9f5c60928a5aad052a0e28c96fb0d6d0a1de3edd9bcf51a831a148f2b14b4f' 
  AND token = 'mnDkDp/QZvxnyAMhQicumHOzw0rpTjda3ETBvF/s1kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}