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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52849b879f58fda8c809375bc50f78b7c1dc1b8267d0281778f65c25bb0843bd' 
  AND token = 'C9UOzTvEIPQHe5zvxHtYGu5W7mMn3g9UrLho2UWIbDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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