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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54f4a57beb12e9e17b9f53ebc0dc65f548fbf71505b3f1f4ab6837101abde2a' 
  AND token = '9JrS2gFTStxcN7/5cyTYETslH+BeA79hN0UBt6TJjjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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