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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae308ab62c390ae3e5adab4346ae2404b15aa63bd349c1a37683b062be534f74' 
  AND token = '85EQyhNS9vnTOZQXhKUa9l3LQEVN/OEmf90t9+GOlus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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