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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1e0c1d888ce20afc79d7d367ddec72888b2b7f4085298090702cb96bad7c8d' 
  AND token = 'ws6mjQ6RghYsxmUPLeqmqt5UTor1ii+rxutkttLvnzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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