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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e5fdd2fa14fcf61f91489d078edfdb6d4e0af593d19191c65bb8d07140abfa1' 
  AND token = '8OQUz46OEEAnSP6EI6jLW6W8t0VDKQrCyjlhONO0YjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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