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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799eb23a8eeee36db75e1bcd9f49eb0f1816e8592498b2228297ab07cf2a8c79' 
  AND token = 'u6vNLCIbr2J4tMa6nZXYWxrD3ImxPSa2aCCUbqF3uOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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