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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f64431964eef3c3bdb4c578ba36f138cef76888a9eb0e7ae2e80347f4c9f0c' 
  AND token = 'f8qx8ml2OSMa6HwlrcEBLZufxmOxBUJ4X56uhrMQ+dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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