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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac743aee1a4b11c59902492293e91b706c01a59728cc2accaa3ba6c0272609f' 
  AND token = 'WWCB5SXQx9S8myR6CpI4uOZDZmqDy8jO1NnbEI8Wrd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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