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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031f7c0979c9b0a7baf8402f7948947a702db9e1a24887ef1745be175dc639ea' 
  AND token = 'UwGsZRoqJNdVTapsdr2yz6IYwF0RnYdidF9W0H/ZK6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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