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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ed70f0536e21d1ee3abe2518b2b5ed49dbe0b9854a4f7b1cfd552e2510322d' 
  AND token = 'xQGYxP3a49wkOY4CBD5cvkuz4nmp23fdRYQ0lliZGDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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