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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c39df0866f3dff43906d37420afee932a9ad4c692c4f524df9a308d6f17175' 
  AND token = 'nsb0ldBSJc4YZpcYmYU4xuveTcQ40T2Imb87a42L8Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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