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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dadea0226748e8720ff4fd4a7597a59c795d978e70318b2962bfbc10743425f' 
  AND token = 'it9paZA5aXv794xXDs7p5l9tKByjo4QDKlkzG2ZY994=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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