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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9f424234e34d2ff7537dc9d10713e46a15fb537dde0eae481ac29457523f25' 
  AND token = '1KHQlV4VwoMyr1ncuz6V9vP5PH6DI8ueBJCZwhXlOD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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