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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4df4877c6ba1d331c8fb2bd14d650d5c2ce34868aa9561662f57e206ddef681' 
  AND token = 'DEflMtQYLkD0AVeldCuoYUdx4B6/xseHPZhinc93r9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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