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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a6e14217ed96d6951ccd5a3057e423b6370dc1bf7de1da0353d56eeedb147f' 
  AND token = 'nBBYL9spCc1s9F/YyFAQ0mUrzZGWuVzfnCxR3g9D6t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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