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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ced30b474ea44405c5c281a2a2d560ab3982e3b3f19ee740c905a919ed2230' 
  AND token = 'WlxTiVtuuJTctt+g2WY2ej0rrIRAisPoE6I+ISJj89U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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