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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b88293c7219ee751eb9fe992e57353b383f3bc49dd1f36710325d9736f910b' 
  AND token = 'WLH3hCZgB1zof5PtSs0ITigCPX9LAAlsEvQq0OrkJS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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