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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e9a283ec7adb78f261726738571063f92b47ac6acf42c1bc03a939801de5ff' 
  AND token = 'f2rE4lASeRm3xSz3HwnfvJlKj6GLAqJbuYX8bwB2D14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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