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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0eb29a980b0b1bd0659695b7139d391c76ee18f20d704bdbd271d62a3b2809' 
  AND token = 'ZMmC3Uax/FkqF5OKvgo9dXL4F09Or9msv6//aRq5gII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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