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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f56c4c83a703688ae2d007b8e536e2a52f4b715d219e7099a78957acddb40dfb' 
  AND token = 'Z8fnztQimqa0bbAiquB3RLHNxiq5rXjAQGu513sOAfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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