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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb7e3029be4b7a5f5c59cde3ff11771c04770cbdfaf2976ccc54e53378d8b97' 
  AND token = 'eka8wQsZwEe/MJAnNck11eK4NE+vjLc0QlyYmWrpMqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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