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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6a2b1777dd15dc8d08418816fb251c296f799dca9a427b2308693bc6906dbfd' 
  AND token = 'tfXHNwe7XJw+InHDw+tovUxnEVJVjbNgWP7Q4AQHi9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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