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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89f9da035b83ad7f03a8bf4d1e6d36cbf70a4c2ea09663c3ced2f0713259b1c8' 
  AND token = 'E3stiCseHfw4Au6GdLYr6dz+upkKUl3YpsFPOge4AXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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