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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704bb7435e9ff183ffdd6798d4dbf7360c437b792eed99f26ab27706e4d67f93' 
  AND token = 'eiyzn6Qd8LCucaWB7x+49o7sVCZpIC368Q3q7q/ZqDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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