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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754ed6087b682c3b9f02ad6c4bdd1e4ac4f427cc80db3eb7cac6b4562f4b6cee' 
  AND token = 'r+8l7sYCsQWxWAk+puU8Z42h8/xXU25HLqyq+kX774Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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