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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5563c8663fb4df90142aa14b9f0d9f1c5fe92002c34e3d99e2a11fe944c4dc' 
  AND token = 'hy+zfXzLluQcn5wmxmZlMGIn9jR0VudDYDS8Nl1qQPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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