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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1660cc50c9db7a692e49590c495c0a60c256e8afbefdb5aaa9ae74ddf4adf19a' 
  AND token = 'X6F8PdznNwYZZq5vJV4gADJtZSHGns4dE1CevLUhxD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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