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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd329cd03a3bc49f48ea9c426e512d382e8cb0e52572aacd6ebcc5bb040a3277e' 
  AND token = 'V9Rrc+YkiGqUHEVXKR0+U/9XNljZC9oU8A1hMSIkxEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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