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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c16c53bda12bc82d6b3b35d4781137762b2b74c09f1952888836d2d9f72712' 
  AND token = 'Fx5usGa24vTd9vufE1Ow1nsoBxuU4bjPx26nRZ0oHAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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