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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0707078d7d8c170b98bfcf123ea0688e1cfe10f3eee0283cacf0fb4a1cbdd665' 
  AND token = 'PHv8Wyri7OSPDbm6vh1tdNPTgljOhTi7WNEFBBC5/XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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