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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127af62db7c1473cd6aefc833bb8d056b925e3f26e60fe759a323f995dbfea0c' 
  AND token = 'dnLYxh+tQkvPlzG+yepWoKDgAszcXnZoR8oFpSPes34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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