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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018767a747a953e1d883b834131ec09a67384828f5b8dd265cf3dc5f625cb75a' 
  AND token = 'Ua947rJLImUVsMwXbXlrNFsr9FxO9c41+kOgyC7v2sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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