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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd192ba6b9c9ace12ba0acf2f4706bcbf79ae7482fcc5fe7ddce5275d0b94779c' 
  AND token = 'tFlb9uhDMuOCe6T6Ueag4vwIbBf0s+gYEIe9xpQFVZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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