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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dd574c9d72208366045dd2427cf4e557efd9c6d70d130836446bd485ad1e95' 
  AND token = 'lwtGqhRGDRCRxPx5KJSkFloX60mbMyfttylVWfBmB6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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