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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c630faf0758541a96b6e050c282759245b2603c121da6bc5e253762451298ae8' 
  AND token = 'ewlHMGe+Ppn68+rRrDOY/0C8UQEl6MonuVs4sCJWk+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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