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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa88a59a8ed0ba039c1285757c35e012eece4daf6e1486c918e4a3981d21526' 
  AND token = 'axshvnTDcbxY0Hqn0TGyKu4VL1Mxqtl1GzSXtZ0dIbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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