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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3935bece5a84c44f2eda7b8be59fe36d49cd537b761d25916ab380c0cbeb9829' 
  AND token = 'PDvh5OHH51dfgCjEp3NNAWUptboam8hS1CDtDgdFGxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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