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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d2ecb37e62c3ee59fa214ba3de48c570ae37c5b6f11a819d5518ef4fad8ea7' 
  AND token = 'Sb5OmBDeOYKweEw13n3R5wPKMfGN+G/1ZBHsUdVQ6U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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