SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c80fe9005e0bd835f88df781c95d6625cc54a4f0b674f55b4752e9373676272' 
  AND token = 'lc50vH7w2IefCt5gufT32DFj/LBQc4GqzZ/WCSxJim4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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