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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a30c63d937daca4540a518ddcad119c402dcaa855c25287aac5b70859359e8' 
  AND token = '7uWDKy1Ze4N29vo492BQmoAQzdvqs5W7YwzNgUH9oY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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