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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d96d45256a7c5dd86545ab5f5c3ac15325b0b13cea4127072a8292ac9c4260' 
  AND token = 'xes1x0adZGnh3QruwRIu2VZa8WhZfIIiWdhx5v8FLHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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