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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9b9e8604f7e91ab74acde082bc30b3a7dfd42bd30443d2e5cbd77632c3d6e1' 
  AND token = 'CAvl2cT+G9NXGiUyMBwK6um7ugWZ1gibrBwiau+2ENw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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