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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f44aa90ee1b7669123de407db69db9d87b8aefc2d8a4d860c47a2ec443430ae' 
  AND token = 'yxySrLtHqeYCj2IJFBom+GskTNtwYtUwGdVO/0l89Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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