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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008a1e43227ff59fda0e61a6ebb5acb484cc790cdc1915b94814d1f1ab04b271' 
  AND token = 'thqUwnyus/3sOTgatqE1IklVjwkQWIgXExGQmhSP5OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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