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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269b9e118ed383854f5f7550bf33ccb8fe218133f364b613c456759ddc410706' 
  AND token = 'Pp9d4LLmnxDesBlXwBrOc1IEQ/JL8by+e1T9KF3df+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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