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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ccca2a0caa7d016e0b3c0574a617208ab293f1c1d6bccbba418da45cb21106' 
  AND token = '5vUMWZeK7h8fGlr3jwPAAMDpb6beNDb4tGjRnSXsDaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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