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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12040a745d8e792b57261ce97b1e8eb84c8d0da0c8d875a3a022024458daa5a8' 
  AND token = '7Qyous4uQo5QCTsiq179KGurVHOlgPQzd6OQFlPsV2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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