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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6344e89d02d527abecc617f569cdb7be5b5384a1521395d873a69dabfe5af4' 
  AND token = 'sW6gbQ/hBgl3k0W1EjUGOrkU9k9d2ffx/QVT2vaG5NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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