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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dc83e7c95de8c8941e8d3815eed2127c3602c8b2c54a25146de9af76d0f071' 
  AND token = 'VIziKsivoAmKtkhvX9QE36LtFYk+0kCSw1YdD5hPi5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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