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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea954ebcb1f3680990937013f253b2b9ae5687e19778990b09ca2ca3b638fea' 
  AND token = '8zUtu7QC4pL0ZtqEE9Sj0IenlPDgy8Q8hSy4LjKhhQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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