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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4a43f767bea9bf6754e85029b43d4ec121ea390b0a37e0abc3517259c86110' 
  AND token = 'gyZMfcJwxmCbmi0Ipg/hO8dkLimyKJPeX6OfL77rrDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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