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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1350ac57f58caa40b6772ea6bc3817ae503c35b82463065bb3e32cc677c270' 
  AND token = '1AprBlwhbH8FJKDlm5DP12bpJjcwW3jEIuRTlsNUfm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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