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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b602f2fd26dfbd13a18ce1fb486c500a24eebe67adf6713d15418768eef965' 
  AND token = 'MK3b/Xzc5W77ge29YLHcjXoLWrZnf4+V73ZEOAFaZwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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