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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e43abf74bdd9bd5bb36e200e7a57d640b44a20ebbd9addc832bd938447cc62' 
  AND token = 'qAC/9fdxz4ex1l1s+brjXgLJ604tFjpUEx2QEzvu1qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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