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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912f8fa513eda2ce0527ccc078d3a38525a9da75cf3225b9991aff2ad8891538' 
  AND token = '/KJ8ynB4cBGL4SHYjY+tpkcMuEqWfI48cP8T58hQJEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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